But is it ACTUALLY an honour to be the first man the Portuguese boss brings into a club? Check out the video above and you'll soon find out.

The clip features a look back at Mourinho's five previous jobs and identifies his first signing at each club. And the results are, well… interesting:

Porto (2002): Maniche

From Benfica, free

(Image: Getty)

Chelsea fans may not think all that much of Maniche - he followed Mourinho to Chelsea for an unremarkable eight-game loan spell in 2006.

However, there was a good reason his former gaffer wanted him at Stamford Bridge: he was a key part of the Porto midfield that won the 2004 Champions League.

VERDICT: Hit

Chelsea (2004): Paulo Ferreira

From Porto, £13.2m

(Image: Getty)

A dependable, reliable, hard-working full-back who, despite not being the most gifted, used ever ounce of his ability to win every major trophy going.

Pretty much the perfect Jose Mourinho player.

VERDICT: Hit

Inter Milan (2008): Mancini

From Roma, £9.75m

(Image: Getty)

A Brazilian stepover fanatic doesn't sound much like a Mourinho favourite. And guess what? This winger wasn't.

An arrival that had clearly been planned before Mourinho joined the club never really took off. By 2010 he was on loan at their neighbours Milan and soon after that he was back playing his club football in his homeland.

VERDICT: Miss

Real Madrid (2010): Angel Di Maria

From Benfica, £20m

(Image: Denis Doyle/Getty)

Man United fans may still shudder at the sight of him, but there was a reason their club paid £59.7m for the ridiculously scrawny Argentinian. Under Mourinho at Real Madrid, he became one of Europe's most dangerous players.

Next!

VERDICT: Hit

Chelsea again (2013): Andre Schurrle

From Bayer Leverkusen, £18m

(Image: Getty)

A tough one, this. Not a flop by any means, the German World Cup winner did more than enough to justify his transfer fee.

But although Chelsea made a (small) profit when they sold him to Wolfsburg in 2015, Mourinho wouldn't have let him go if he'd been a roaring success.

VERDICT: Miss

Man United (2015): Eric Bailly

From Villarreal, £30m

(Image: Manchester United via Getty)

That's three hits and two misses. So will Bailly be another Di Maria or a Mancini repeat?